Program takes long time to create batch

Hi,

I am uploading batch using a custom program which uses BAPI_BATCH_SAVE_REPLICA.The program takes 4 hrs for uploading 100000 records.

But when I am using a file with 400000 records. It creates the second batch after 8 hrs from the starting of the batch job. The job takes

more than 50 hrs to complete.

Any suggestion?

Regards,

Tan